Cooling provision for internal-combustion engines



Dec. 21 1926. v

1,611,620 A. w. WALL 1 COOLING PROVISION FOR INTERNAL COMBUSTION ENGINES Filed July 6, 1921 1 1. m I i F jfi'lfl Patented Dec. Zl,

ARTHUR, WILLIAM TALL, F SHELDON,

NEAR BIRIVZEEIGHABE, ENGLAND, ASSIGNOB OF THREE-FOUBTHS TO JOHN "WHITE, GE BIRJVZKEQGZEAM, ENGLAND.

COOLING PROVISION FOR IN Application filed July 6, 1921, Serial No.

This invention comprises certain improvements in or relating to internal-combustion engines, the said engine being based upon my prior patent Serial No. 316,193, filed August the 8th, 1919, in U. S. A., and refers particularly to engines of the sleeve or slide valve type, the object of the present invention being to provide in a particularly effectual manner for the cooling of engines 10 of this character.

This invention is particularly directed to engines of thetwo-stroke type, or to engines having an exhaust port or exhaust ports in the cylinder wall, and according to the present invention, the engine in the vicinity of said exhaust port or exhaust ports is cooled by gaseous fluid, such as air or explosive mixture, flowing both above and below said exhaust port or ports in a case in which the axis of the cylinder is vertical. In such a case I advantageously incorporate provision whereby a descending annular stream of air envelope the cylinder above the exhaust port or exhaust ports, and this descending annular stream of air may be encircled by an outer ascending annular stream of air which communicates with the descending stream at the top of the engine.

In this way thesparking-plug may effectually be cooled.

An ascending stream of air may beincorporated below the exhaust port or ports,

but alternatively or additionally the exhaust instance, in the transfer port or ports and/or in the inlet passage, or passages to the pre compression chamber.

' Advantageously the cooling air is adapter to admix with the exhaust gases. The air emitted may serve to avoid egress of charge caused by exhaust actions, and may also serve to cool and thereby reduce the volume of the exhaust gases.

In order that this invention may be clearly understood, and readily carried into practise, reference may be had to the appended explanatory sheet of drawings upon which:

Figure 1 is a sectional elevation of an engine embodying the present invention.

Figure 2 is, in its lower half, a section on line 1-2 of Figure 1, and in its upper half a section on line 3-4; of Figure 1.

port or port's may be cooled from below by a stream ofexplosive fluid occurring, for

TERNAL-GOMB'UEWIQN ENGINES.

482,838, and in Great Britain July 23, 1920.

Figure 3 is a section on line 5-6 of ure 1. I i

In aconvenient. embodiment of the present invention, and referring to the drawings, a is the cylinder around which are located a series of exhaust ports 6 below which are a series of inlet ports 0 leading from the crank-case nrecompression chamber (Z. The exhaust ports 6 are located above the inlet ports 0, but both the exhaust ports 6 and the inlet ports 0 are located at such a point that they are uncovered only when the piston e is at the limit of its dead outstroke. A sleeve valve 7" operated bv a worm f controls the exhaust ports 2') and encircles the transfer passages g from the pre-comp'ression space d to the working expansion chamber. The sleeve valve 7 is adapted also to control the ingress from the carbureter at h to the precompression chamber at a time when the transfer passage ,7 are closed by the piston e.

A cooling air inlet 2" leads to an annular space j divided by radial fins and separated by an annular partition 7: from an inner annular channel Z also divided by fins, the arrangement being such that air is enabled to descend within the channel j and subsequently descend within the channel Z, communication between these two channels being oflered at m, and alsothrough channels provided by fins n encircling the sparking-- plug 0. Upon completing its descent within the annular channel Z, the air mixes with the exhaust emitted at the'ports b and egressing at 10 by way of the-exhaust. The top of the outermost casing is detachable at j for access to the sparking plug.

Air is also adapted to enter the wall of the crank chamber at g and to ascend around the same at 1" within suitable channels. These channels communicate with channels 8 provided in the wall of that part of the cylinder which encircles the sleeve valve f, and the air emi ted from the channels 8 at the top thereof is adapted also to emit with the exhaust emitted at the ports 6. The channelss are formed by the provision, of fins. Other fins a may be provided at that part of the sleeve valve which encircles the exhaust ports. The exhaust ports occur between alternate fins, and those fins between which no exhaust port occurs may be closed by a circumferential partition at their outer extremities to form a conduit (not shown).

In connection with the general construction of the engine, reference may be had to my prior Patent No. 316.193.

lVhat I claim as my invention, and desire to secure by Letters Patent is:

1. In an internal combustion engine, a cylinder having exhaust ports therearound, at a point where said ports are uncovered when the piston is in outstroke position, a casing enclosing the cylinder, said casing having exhaust openings through which the cylinder exhaust ports discharge, and also having a cooling air inlet opening, and a chamber to which said opening leads, said chamber containing the combustion chamber of the cylinder and communicating with the exhaust ports of the cylinder and the e haust openings of the casing and an annular partition in said casing and around said combustion chamber, spaced from the. walls of said casing and said combustion chamber, open at its lower side and also having an opening at its upper side for the admission of the cooling air, said partition forming a battle in the casing which causes the cooling air drawn into the casing to be directed upwardly in the casing and around the partition and then to be sucked down into the space between said partition and the combustion chamber and around the latter before reaching the exhaust ports.

2. In an internal combustion engine, a cylinder having exhaust ports therearound, at a point where said ports are uncovered when the piston is in outstroke position, a casing enclosing the cylinder, said casing having exhaust openings through which the cylinder exhaust ports discharge, and also having a cooling air inlet opening, and a chamber to which said opening leads, said chamber containing the combustion chamber of the cylinder and communicating with the exhaust ports of the cylinder and the ex haust openings of the casing, and annular partition in said casing and around said combustion chamber, spaced from the walls of said casing and said combustion chamber, open at its lower side and also having an op ening at its upper side for the admission ot the cooling air, said partition forming a baiiie in the casing which causes the cooling air drawn into the casing to be directed upward ly in the casing and around the partition and then to be sucked down into the space between said partition and the combustion chamber and around the latter before reaching the exhaust ports, and fins arranged between the said partition and casing and forming channels therebetween for the upward passage of the cooling air.

3. In an internal combustion engine, a cylinder having exhaust ports therearound, at a point where said ports are uncovered when the piston is in an outstroke position, a casing enclosing the cylinder, said, casing having exhaust openings through which the cylinder exhaust ports discharge, and also having a cooling air inlet opening, and a chamber to which said opening leads, said chamber containing tl'io combustion chamber of the cylinder and communicating with the exhaust ports of the cylinder and the exhaust openings oi the casing, and an annular partition in said casing and around said combustion chamber, spaced from the walls of said casing and said combustion chamber, open at its lower side and also having an opening at its upper side for the admission of the cooling air, said partition forming a battle in the casing which causes the cooling air drawn into the casing to be directed upwardly in the casing and around the partition and then to be sucked down into the space between said partition and the combustion chamber and around the latter before reaching the exhaust ports, and a spark plug at the upper end of the combustion chamber and in said casing and in the space between said partition and combustion chamber and arranged for cooling by the cooling air.

1-. In an internal combustion engine, a cylinder having inlet and outlet openings arranged therearound in a direction transverse longitudinal axis thereof and in the vicinity of the piston when the same is in outstroli'e position, and means to cause a c ntinuous fluid blanket to be directed past the delivery end of each exhaust opening.

5. In an internal combustion engine, a cylinder having inlet and exhaust openings arranged therearound in a direction transverse to the longitudinal axis thereof at a point in the path of the piston when the same is in outstroke position, and means to cause a continuous fluid blanket, to be directed past the exhaust opening and isolate the exhaust gases therefrom as such gases leave the cylinder.

6. In an internal combustion engine, a cylinder having exaust ports therearound, at a point where said ports are uncovered when the pi ton is in outstroke position, a casing enclosing the cylinder, said casing having exhaust openings through which the cylinder exhaust ports discharge, and also having a cooling air inlet opening, and a chamber to which said opening leads, said chamber containing the combustion chamber of the cylinder and communicating with the exhaust ports of the cylinder and the exhaust openings of the casing, and an annular partition in said casing and around said combustion chamber, spaced from the walls of said casing and said combustion chamber, open at its lower side and also having an opening at its upper side for the admission of the cooling air, said partition forming a battle in the casing which causes the cooling air drawn into the casing to be dito followra staggered path first upwardly l'eeted upwardly in the casing and around and then downwardly and directly around the partition and then to be sucked down the combustion chamber before reaching the 10 into the space between said partition and exhaust openings.

5 the combustion chamber and around the lat- In witness whereof I have hereunto set my ter before reaching the exhaust ports, and hand.

means in said casing to cause the cooling air ARTHUR WILLIAM WALL. 

